13-year-old Autistic boy flies cross country, alone.

13-year-old Kenton Weaver of Boca Raton, Florida, has a form of AUTISM called Asperger's Syndrome . . . and he's completely obsessed with AIRPLANES.

--In fact, Kenton's so fascinated with planes that on Tuesday, he stole his dad's car, drove to the airport, and used his dad's credit card number to buy a ticket from Southwest Airlines.

--Then Kenton boarded a plane and flew across the country to San Jose, California . . . ALL BY HIMSELF. But listen to this . . .

--Since he's only 13, Kenton doesn't have a passport, a driver's license or any other form of photo ID.

--That begs the question: How was a 13-year-old Autistic boy with no identification able to slip past airport security . . . in order to board a cross-country flight?

--And more importantly: What does it say about the state of our airport security, in general?